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On 05/05/2014 13:22, Matt Turner wrote: |
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> On Mon, May 5, 2014 at 7:06 AM, Markos Chandras <hwoarang@g.o> wrote: |
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>> Hi all, |
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>> |
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>> Right now the number of stages for each endianness is 8: |
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>> |
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>> - mips1 |
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>> - mips32 |
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>> - mips32r2 |
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> |
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> Do we need r1 and r2 stages? |
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> |
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> (Isn't r3 a thing now?) |
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I cannot speak for anything outside of the standard/original MIPS ISAs, but |
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I thought we killed off mips1 long ago. When did that come back? Almost |
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anything out there should be able to handle mips2 at a bare minimum (only |
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R2000 and R3000-based systems, like certain DECStations, would need mips1). |
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mips2 is also the branch point for the mips32r* ISAs, so if any of the |
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original, 32-bit ISAs should be kept, that would be mips2. mips1 can go. |
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|
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>> - mips3 |
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>> - mips4 |
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>> - mips4_r10 |
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> |
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> Big endian only. |
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> |
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Seconded. We still support SGI systems, which max out at the mips4 ISA. If |
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we drop support for mips3, that will cut off any R4x00-based Indigo2 and |
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Indy systems, but I believe those to be fairly rare anyways (and the R4600 |
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still has quirks about it that can pose challenges). |
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mips4 little-endian is only useful for the old Cobalt RaQ2 and Qube |
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hardware, which I don't think is reasonable anymore. Modern gcc takes long |
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enough on an SGI system with a secondary cache -- the Cobalt's low-powered |
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RM5231 with no L2 would make 4.8 or 4.9 even more excruciating. Max memory |
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there is 256MB of RAM, and I don't know if gcc-4.9 will build under that. |
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And I don't see a point in doing an R10K-specific mips4 build. The standard |
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mips4 build is good enough, and users of R10K systems can rebuild to gain |
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the R10K enhancements if needed. |
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So, keep mips4 big-endian as a standard stage build, let's do a mips3 |
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big-endian build maybe once or twice a year, and drop mips4 little-endian |
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and R10K mips4. |
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-- |
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Joshua Kinard |
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Gentoo/MIPS |
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kumba@g.o |
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4096R/D25D95E3 2011-03-28 |
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|
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"The past tempts us, the present confuses us, the future frightens us. And |
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our lives slip away, moment by moment, lost in that vast, terrible in-between." |
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--Emperor Turhan, Centauri Republic |
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